KV-34FV310 (serv.man2) - Sony TV Service Manual (repair manual). Page 6

3 times

2 times

4 times

5 times

9 times

10 times

LED ON 0.3 sec.

LED OFF 0.3 sec.

LED OFF

3 sec.

 

+B Overcurrent 

 

2 times

 

+B Overvoltage 

 

3 times

 V-STOP 

  4 

times

 IK 

(AKB) 

  5 

times

 

Zero Cross 

 

9 times

 9V 

 

  10 

times

*One fl ash count is not used for self-diagnostic.

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER LED will automatically begin to fl ash. The number 
of times the LED fl ashes translates to a probable source of the problem. A defi nition of the STANDBY/TIMER LED fl ash indicators is listed in the 
instruction manual for the user’s knowledge and reference. If an error symptom cannot be reproduced, the Remote Commander can be used to review 
the failure occurrence data stored in memory to reveal past problems and how often these problems occur.

Diagnostic Test Indicators
When an error occurs, the STANDBY/TIMER LED will fl ash a set number of times to indicate the possible cause of the problem. If there is more than 
one error, the LED will identify the fi rst of the problem areas.

Results for all of the following diagnostic items are displayed on screen. If the screen displays a “0”, an error has occurred.

Power does not turn on  

Does not light 

•  Power cord is not plugged in. 
•  Fuse is burned out (F601).  

(GW Board) 

•  Power does not come on. 
•  No power is supplied to the TV. 
•  AC Power supply is faulty. 

+B overcurrent (OCP)* 

2 times 

•  H.OUT (Q502) is shorted. (A Board) 
•  IC702 is shorted. (C Board) 

•  Power does not come on. 
•  Load on power line shorted. 

+B overvoltage (OVP) 

3 times 

•  IC501 is faulty. (A Board) 
•  If a high is supplied to pin 2 of IC501. 

(A Board) 

•  Has entered standby mode. 

V-Stop 4 

times 

•  +12V is not supplied. (A Board) 
•  IC561 is faulty. (A Board) 

•  Has entered standby state after 

horizontal raster. 

•  Vertical deflection pulse is stopped. 
•  Power line is shorted or power 

supply is stopped. 

IK (AKB) 

5 times 

•  Video OUT (IC561) is faulty. (A Board) 
•  IC702 is faulty. (C Board) 
•  Screen (G2) is improperly adjusted. ** 

•  No raster is generated. 
•  CRT Cathode current detection 

reference pulse output is small. 

Zero Cross 

9 times 

•  No zero cross pulses on pin 45 

IC1001. (A Board) 

•  Power does not come on. 

9V Check  

10 times 

•  Relay failed (RY600) 

•  Power does not come on. 

*  If a +B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously. The symptom that is diagnosed first 

by the microcontroller is displayed on the screen. 

** Refer to Screen (G2) Adjustments in Section 2-4 of this manual